fix(datepickerPopup): correctly format to timezone

- Format according to ngModelOptions timezone if specified

Closes #6159
Fixes #6105
Fixes #6146
Fixes #6147

Author: wesleycho

src/datepickerPopup/popup.js

@@ -32,7 +32,11 @@ function($scope, $element, $attrs, $compile, $log, $parse, $window, $document, $
 
   this.init = function(_ngModel_) {
     ngModel = _ngModel_;
-    ngModelOptions = _ngModel_.$options;
+    ngModelOptions = angular.isObject(_ngModel_.$options) ?
+      _ngModel_.$options :
+      {
+        timezone: null
+      };
     closeOnDateSelection = angular.isDefined($attrs.closeOnDateSelection) ?
       $scope.$parent.$eval($attrs.closeOnDateSelection) :
       datepickerPopupConfig.closeOnDateSelection;
@@ -123,13 +127,13 @@ function($scope, $element, $attrs, $compile, $log, $parse, $window, $document, $
           value = new Date(value);
         }
 
-        $scope.date = value;
+        $scope.date = dateParser.fromTimezone(value, ngModelOptions.timezone);
 
         return dateParser.filter($scope.date, dateFormat);
       });
     } else {
       ngModel.$formatters.push(function(value) {
-        $scope.date = value;
+        $scope.date = dateParser.fromTimezone(value, ngModelOptions.timezone);
         return value;
       });
     }
@@ -181,7 +185,7 @@ function($scope, $element, $attrs, $compile, $log, $parse, $window, $document, $
 
   $scope.isDisabled = function(date) {
     if (date === 'today') {
-      date = new Date();
+      date = dateParser.fromTimezone(new Date(), ngModelOptions.timezone);
     }
 
     var dates = {};
@@ -328,7 +332,7 @@ function($scope, $element, $attrs, $compile, $log, $parse, $window, $document, $
     if (angular.isString(viewValue)) {
       var date = parseDateString(viewValue);
       if (!isNaN(date)) {
-        return date;
+        return dateParser.fromTimezone(date, ngModelOptions.timezone);
       }
     }